JLINK V9 cannot download the code.

[Ted]

I Modify my code for 7 buttons from 7 gpios. But my code has a issue at sdk_config.h. The define of GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS is 9. When I built the code and download the code to my target board though Jlink V9. It is OK first time. But it always fail if I want to download code again. Does anyone knows why? How to solve it? Why my error program made the target board cannot re-download again.

[Håkon Alseth]

Hi,

 

If the firmware asserts early in the boot-up process (where the default behavior is to do a soft-reset), it can be hard to recover/reprogram the board, as the debugger isn't able to attach fully before the soft-reset occurs again.

 

Could you try to run "nrfjprog -e -f nrf52" and see if this works?

 

Kind regards,

Håkon

[Ted]

Håkon Alseth I try to run "nrfjprog -e -f nrf52", but it also has the error message is as follows. Do you have any other idea to fix it. Maybe connect some pin of hardware to high or low state. I made 2 boards have this issue.  
ERROR: Cannot connect to any nRF device. Please make sure a device is
ERROR: connected to the debugger and supplied.

[Ted]

Håkon Alseth I try  to run "nrfjprog -e -f nrf52" for 30 times. It has the messages as follows. Then it can be re-programmed. Thank you very much. By the way, do you have any suggestions to prevent this issue?

Erasing user available code and UICR flash areas.
Applying system reset.

[Håkon Alseth]

Glad to hear that you were able to recover. If you get into this scenario in the future, try this loop batch script:

https://devzone.nordicsemi.com/f/nordic-q-a/45078/nrf52832-not-connected-anymore-after-first-trying-to-debug-keil/177579#177579

 

Kind regards,

Håkon